Re: Linux Software RAID 5 + XFS Multi-Benchmarks / 10 Raptors Again

[Bill Davidsen <davidsen@xxxxxxx>]

Justin Piszcz wrote:
> On Thu, 17 Jan 2008, Al Boldi wrote:
>
> > Justin Piszcz wrote:
> > > On Wed, 16 Jan 2008, Al Boldi wrote:
> > > > > Also, can you retest using dd with different block-sizes?
> > >
> > > I can do this, moment..
> > >
> > >
> > > I know about oflag=direct but I choose to use dd with sync and 
> > > measure the
> > > total time it takes.
> > > /usr/bin/time -f %E -o ~/$i=chunk.txt bash -c 'dd if=/dev/zero
> > > of=/r1/bigfile bs=1M count=10240; sync'
> > >
> > > So I was asked on the mailing list to test dd with various chunk sizes,
> > > here is the length of time it took
> > > to write 10 GiB and sync per each chunk size:
> > >
> > > 4=chunk.txt:0:25.46
> > > 8=chunk.txt:0:25.63
> > > 16=chunk.txt:0:25.26
> > > 32=chunk.txt:0:25.08
> > > 64=chunk.txt:0:25.55
> > > 128=chunk.txt:0:25.26
> > > 256=chunk.txt:0:24.72
> > > 512=chunk.txt:0:24.71
> > > 1024=chunk.txt:0:25.40
> > > 2048=chunk.txt:0:25.71
> > > 4096=chunk.txt:0:27.18
> > > 8192=chunk.txt:0:29.00
> > > 16384=chunk.txt:0:31.43
> > > 32768=chunk.txt:0:50.11
> > > 65536=chunk.txt:2:20.80
> >
> > What do you get with bs=512,1k,2k,4k,8k,16k...
> >
> >
> > Thanks!
> >
> > --
> > Al
> >
> > -
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>
> root      4621  0.0  0.0  12404   760 pts/2    D+   17:53   0:00 mdadm 
> -S /dev/md3
> root      4664  0.0  0.0   4264   728 pts/5    S+   17:54   0:00 grep D
>
> Tried to stop it when it was re-syncing, DEADLOCK :(
>
> [  305.464904] md: md3 still in use.
> [  314.595281] md: md_do_sync() got signal ... exiting
>
> Anyhow, done testing, time to move data back on if I can kill the 
> resync process w/out deadlock.

So does that indicate that there is still a deadlock issue, or that you 
don't have the latest patches installed?

--
Bill Davidsen <davidsen@xxxxxxx>
 "Woe unto the statesman who makes war without a reason that will still
 be valid when the war is over..." Otto von Bismark